Abstract
When drilling Inconel 718, the drills are exposed to high mechanical and thermal loads. The cutting zone is located inside the workpiece, whichmakes it challenging to provide sufficient metalworking fluid to the cutting zone. To solve this, drills with internal cooling channels are commonly used. However, no standard on the design of those channels exists. In this work, the influence of different cooling channel designs and different second tool orthogonal clearance angles on tool life, process forces and bore quality have been investigated experimentally. The results reveal that tool lifetime can be influenced in particular by the size of the cooling channels.
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